Which metal in period 5 is very reactive and has two valence electrons in each atom?
rubidium (rd)
strontium (si)
zirconium (z1)
silver (ag)

This element exists in adundance in the sun. explain how you would go about capturing sunlight. would this captured sunlight contain any of the element?

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

In which reaction is precipitation occurring?